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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        let arr = [1, 2, 3, 4];
        // 复制一个新的数组，并且向新数组的前面追加元素
        let arr2 = [0, ...arr];

        let obj1 = {
            name:'atguigu',
            sex:'boy',
            age:10
        }

        let obj2 = {
            ...obj1,
            age:100
        }
        console.log(obj2);
    </script>
</body>

</html>